Well i'm hooked after an hours gameplay hahaha, they sure have better/quicker tanks then me, but I will get up there soon enough.
I never went premium, if I have a bad game in either my T29 or my Ferdi I lose credits, and can lose in a big way. The Ferdi costs ~11K to repair, and 1030 credits a round...and it carries 40 rounds. The game in the screen shot above was a decent game for me, and I made ~5k after paying repairs and ammo. If that had been a loss, I likely would have lost at least 5k.
Lowe and T34 are probably the only 2 premium tanks I would consider getting. I am not really sure I want to spend that much on a tank though. It took me a year to get around buying the gold I did buy. I don't mind supporting games/companies either just right now I don't see the need.